A.一個(gè) B.多個(gè) C.一個(gè)或多個(gè) D.零個(gè)
A.drop index B.create index C.sp_help index D.update index
A.select 2 * from職工 B.select top 2 * from職工 C.select percent 2 * from職工 D.select 2 from職工